Automatic and seamless vertical roaming between wireless local area network (WLAN) and wireless wide area network (WWAN) while maintaining an active voice or streaming data connection: systems, methods and program products
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United States of America Patent
Stats
-
May 2, 2006
Grant Date -
Jul 4, 2002
app pub date -
Dec 14, 2001
filing date -
Dec 28, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A Mobile Station (MS) is able to vertically roam in either direction between two different nerworks, i.e, WWAN and WLAN. The MS is equipped with a dual mode Radio for WWAN and WLAN transmissions. The WLAN Radio is linked to a WLAN Enterprise Gateway Controller (EGC) via a first air link and the WWAN Radio is linked to a WWAN Base Transceiver Station (BTS) via a second air link. An outgoing VoIP call from the WLAN Radio to a remote party on the WWAN will transition or seamlessly switch over to a WWAN connection when the MS detects packet error rates, frequent scale back or consistent signal degradation.
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